Writing to program memory....

[Trampas]

I am trying to get a boot loader working. I am writting my own write to program memory function as that the CCS function is not truely inline, it actually calls a subroutine. I am working with the 18F series parts if it makes a difference. So far here is my code but it does not appear to work...

[asmallri]

Looks ok. A couple of comments. When finished you did not disable the write enable

[Trampas]

OK with a little work I figured it out...

I had two major problems, first was I needed to predecrement the TBLPTR, second was the TBLPTR incremented and the program was happening 8 bytes off from where I wanted. Here is the code that works for other poor suckers like me...

UBYTE PgmFlash(UDWORD address, UBYTE *data) //8 bytes
{
UBYTE i;

TBLPTRU=(UBYTE)(address>>16);
TBLPTRH=(UBYTE)(address>>8);
TBLPTRL=(UBYTE)(address);

#asm
TBLRD*- //dummy read to decrement
#endasm

for(i=0; i<8; i++)
{
//printf("%x ",data[i]);

TABLAT=data[i];
#asm
TBLWT+*
#endasm
}
TBLPTRU=(UBYTE)(address>>16);
TBLPTRH=(UBYTE)(address>>8);
TBLPTRL=(UBYTE)(address);

disable_interrupts(GLOBAL);

#asm
BCF EECON1, 4//FREE // disable Row Erase operation
BSF EECON1, 7 //EEPGD //point to Flash program memory
BCF EECON1, 6//CFGS //access Flash program memory
BSF EECON1, 2//WREN // enable write to memory
MOVLW 0x55
MOVWF EECON2 // write 55h
MOVLW 0xAA
MOVWF EECON2 // write 0AAh
BSF EECON1, 1 //WR //start erase (CPU stall)
NOP
BCF EECON1, 2//WREN
#endasm


return 0;
}